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Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants (video)

Andrew Buchan


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  <dc:creator>Andrew Buchan</dc:creator>
  <dc:date>2021-10-26</dc:date>
  <dc:description>The PLATO mission will discover a large number of terrestrial exoplanets, providing measurements of their radii. However, to determine whether an exoplanet is ‘Earth-like’, we must also understand its geological composition. The composition of a planet has wide ranging implications for its subsequent evolution and habitability. Ground-based follow-up to the PLATO detections can constrain planet masses and inform our knowledge of planetary interiors. In this talk, I will discuss a complimentary technique that can further improve our understanding of planetary composition and the geology of rocky exoplanets.

Polluted white dwarfs which have accreted fragments of rocky objects provide a unique opportunity to probe exoplanetary interiors. These accreted fragments are often rich in either core-like or mantle-like material, which inform us about the core and mantle compositions we can expect to find in exoplanetary bodies.

In this talk, I will present an approach to modelling the abundances of non-Earth-like core and mantle compositions observed in polluted white dwarfs. We use data from metal-silicate partitioning experiments to calculate the effect of non-Earth-like conditions on the distribution of elements between the core and the mantle. The resulting non-Earth-like compositions may be useful for interior structure models of exoplanets.</dc:description>
  <dc:identifier>https://zenodo.org/record/5600862</dc:identifier>
  <dc:identifier>10.5281/zenodo.5600862</dc:identifier>
  <dc:identifier>oai:zenodo.org:5600862</dc:identifier>
  <dc:relation>doi:10.5281/zenodo.5600861</dc:relation>
  <dc:relation>url:https://zenodo.org/communities/plato2021</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:title>Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants (video)</dc:title>
  <dc:type>info:eu-repo/semantics/other</dc:type>
  <dc:type>video</dc:type>
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